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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Scintillation - A combination of the sparkle and pattern of a diamond.
Sparkle is the appearance of spots of light that flash as the diamond moves. Pattern is the arrangement and contrast of the bright and dark areas of the diamond resulting from light reflections.
Scratch - a thin, dull, white line on the diamond's surface.
Can be removed by re-polishing, but the diamond might lose a little weight.
Shape - diamonds are cut into numerous shapes, with the most popular being round brilliant.
Also referred to as fancy cuts, shapes include round, marquise, cushion, emerald cut, pear, heart, trillion, radiant, princess cut, Asscher, oval, Old European cut, old mine cut, baguette, half moon, among others.
What diamond do you have?
SI - clarity grade of slightly included (SI1 and SI2).
Sparkle - the appearance of spots of light that flash as the diamond moves.
Surface Graining - See Graining
Symmetry - Symmetry is the exactness of the shape and placement of the facets.
A diamond should look symmetrical. It should be round (as opposed to off-round), the table should be in the middle of the crown (i.e. you should see equal amounts of the pavilion each side of the culet when viewing the diamond through the table), the culet should be in the middle of the table (i.e. the culet should be centered on the pavilion), the girdle should be flat (as opposed to being wavy), among other symmetries.
Synthetic Diamond - a man-made diamond created to simulate a diamond.
It's created by using high pressure high temperature (HPHT) or lab grown using chemical vapor deposition (CVD) process. GIA and other labs can determine whether a diamond is natural or synthetic.